Unless you find bandages, antidotes, or painkillers, you can't heal your character. If you are worried about your stuff. Run to the nearest safe zone and put all of it in your GI. So if your character dies, you don't lose anything.

You may have received a penalty from Punkbuster for whatever reason. Sometimes PB will block an account for a set amount of time (most people I've talked to only waited about 10 minutes). If that's not the case then Idk man, try restarting your computer lol.